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@jesscat: are you running a network firewall that blocks network connections? Many "security suites" do this, as do dedicated firewalls like ZoneAlarm. If the program doesn't know about calibre, it might refuse to permit the calibre server to listen for connections from network (to act as a server). Calibre would see this as a failure to open a port.
The fix is to tell the security program that calibre is permitted to act as a server. How you do that depends on the security program. Somewhere in its configuration you should see 'firewall rules' or 'network access permissions' or some such. More than that I can't say.
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